Centromere splits and chromatids separate; this is a characteristic of which phase?

How many chromatids are present in one chromosome during the prophase stage?

After which phase of interphase does the cell enter into mitosis?

How many main stages are there in mitosis?

Telophase shows the following key events:
$1.$ Chromosomes cluster at opposite spindle poles
$2.$ Spindle fibres attach to kinetochores of chromosomes
$3.$ Nuclear envelope assembles around the chromosome clusters.

What is the correct sequence of stages in mitosis (karyokinesis)?